Assessment of applied microwave power of intermittent microwave-dried carrot powders from Colour and NIRS
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Kuupäev
2019
Kättesaadav alates
Autorid
Keskin, M.
Soysal, Y.
Sekerli, Y.E.
Arslan, A.
Celiktas, N.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Applied microwave (MW) power level is an essential factor on the quality of the dried
agricultural products. Even if higher MW powers result in shorter drying times, they lead to
quality degradations. It is almost impossible to know the applied MW power of a dried and
powdered product by human vision. Thus, the aim of this study was to predict the applied MW
power of carrot powders by using two different instruments, a chromameter and FT-NIRS. The
experiments were carried out at nine different power levels (100–500 W) with three replications
(N = 27). The colour and NIR reflectance was measured using a chromameter and NIRS system.
The data was analysed using PLS regression. The drying time of intermittent MW drying at the
highest applied power of 500 W was 1.12–5.47 times shorter than those of other lower applied
powers. Applied MW power was a crucial factor on all colour parameters of the powdered carrots.
Brightness (L*) decreased significantly with the increase of applied MW power resulting in
darker product colours. Data analysis results showed that the NIRS system (R2 = 0.99;
SEP = 16.1 W) can predict the microwave power of powdered carrots with significantly better
performance than a chromameter (R2 = 0.95; SEP = 29.9 W). But, the chromamater is far more
inexpensive when compared with the NIRS system and hence, it can also be used to predict the
applied MW power from the colour data relatively well. Also, a mathematical model was
developed to predict applied MW power from the colour parameters.
Kirjeldus
Article
Märksõnad
microwave drying, applied power, carrot, reflectance, chromameter, FT-NIRS, articles